7
GSM Cell Phone Failure: –Long period of charging Battery. Solution: - Use Mutil-matter to check the voltage of pin4 of Q1 while charging, this point should be Low voltage. The failure could be coused by Q33, Q4 or Q1 if the voltage is abnormal. Q1 Q33 Q4

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Failure : –Power Supply Circuit Failure Solution : –Test the sets current by using battery simulator,observe the value of current used. –Case 1. If the current is higher 300mA, please check C333. Replace C333 if it has any resistance. C333

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Case 4: –Check the voltage output of Pin1 of U41, the output voltage should be between 2.8V and 3.5 V. – Please replace U41 if there is no output or value abnormal. U41

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GSM Cell Phone Case 5: –Check the voltage output of Pin3 of U39, the output voltage should be above 3.5 V. – Please replace U39 if there is no output or voltage abnormal. U39

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Case 6: –If the value of current looks like short circuit, please replace U9 or U32. U32 U9

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GSM Cell Phone Case 7: - Check the system clock(13 MHz) on the pin1 of U15. -If there is no 13MHz system clock, the failure should be caused by U35 or U15. U15(CPP)

15
Failure –Phone set and battery over heat. Short suspend time. Solution –Test the sets current by using battery simulator,observe the value of current used.If the current is up to 300mA take out U9 or U32 and repeat above motions again, replace U9 or U32 if new value is 0. U32 U9

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Failure –No Back Light Solution : –Replace the LED which doesnt light up if only part of LEDs fail. –All of LEDs fail,please check the soldering points of J1. –Check the circuit trace on UIF board. J1 LED

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Remark Re-calibration will be required after replacing the components in RF section. Components U23 U9 U32 and U31 are the focal point of RF part. This revision only indicates the typical failure for repairing reference.